Telephone



(N0 Medal.)

J. D. HUSBANDS.

TELEPHONE.

No. 318,907. Patented May 26, 1885.

'J zy] Witnesses. l/vfuenor.

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rrnn Starts PAT NT Orr-none JOSE DOTTIN HUSBANDS, OF VALPARAISO, CHILI, ASSIGNOR TO THE AMERI- CAN BELL TELEPHONE COMPANY, OF BOSTON, MASSAOHUSETTS.

TELEPHONE.

SPECIFICATION forming part of Letters Patent No. 318,907, dated May 26, 1885.

Application filed October 13, 1884.

(No model.) Patented in England March 10, 1882, No. 1,177.

To all 1072,0722, it may concern:

Be it. known that 1, Josh DOTTIN Hosnnnns, of Valparaiso, Chili, South America, have invented certain Improvements in Telephones,

(for which Letters Patent of Great Britain were granted me March 10, A, D. 1882-, No. 1,177,) of which the following is a specification.

My invention relates to that class of telephone instruments known in the artas bat- IO tery-transmitters.

The object of my invention is to provide a transmitting-instrument which shall be highly efficient while simpler and cheaper of construction than anything of the kind now in 1 use or known.

My invention consists of an arrangement of parts whose principle of action is the variation of resistance in a closed circuit by and in sympathy with the air vibrations due to the sound-waves produced by the voice or other wise within the mouthpiece. In battery-trans mitters as heretofore constructed the variations or changes in the resistance are due to varia tions of pressure on a variable contact introduced into the circuit between two good conducting points or surfaces; and for this purpose a diaphragm, disk, or plate is ordinarily provided, and a mouth-piece so arranged as to concentrate the sound-waves upon the said diaphragm or disk. In my invention, however, I dispense with the diaphragm, disk, or plate, and so construct the instrument that the mouth -piece itself, or a chamber connected therewith, forms the medium upon which the 3 5 sound-waves act to produce the vibrations. I prefer to use a tubular mouth-piece placed within a suitable chamber or cavity, contain ing a current regulator or variable cont-act medium, consisting of loose particles of finee ly-divided conducting material, such as granulated or powdered coke or carbon. The walls of the chamber are of conducting material, and form one electrode. The tubular mouthpiece is also of conducting material, and forms the second electrode; and the finely divided conducting material is placed in position to form a variable resistance or tension regulator between the two electrodes in response to and in sympathy with the air-waves or soundvibrations, as aforesaid.

In the accompanying drawings, Figures 1 and 2 show two forms of my transmitter; Figs. 3 and 4, a modification. r

In Fig. 1, a is a block of ebonite, wood, or other suitable insulating or non-conducting 5 5 material,to which is attached the mouth-piece, consisting of two cylinders, short tubes, or funnels, b c, of brass or other suitable material, forming the electrodes or conducting-surfaces, between which the regulator is placed. These cylinders are of such diameter that when one is inserted centrally within the other there will be between the electrodes an annular space, within which is placed a finely-divided conducting material-as granulated carbon e-loosely confined by packings of cloth or india-rubberf. d d are two screw-posts, one of which is electrically connected to cylinder 1), the other to cylinder 0.

In Fig. 2, a is a block of wood or other suita- 7o ble insulating material. This block has a cavity or chamber formed therein and lined with metal or other good conducting material, as shown at 6. Within this lined cavity or chamber I insert atube, 0, constructed of thin metal 7 5 or of a thin substance coated with metal, and so formed and arranged that there is an annular space between it and the said lining bthat is to say, between the two metal surfaceswhich space is filled, or partiallyfilled, with powdered or granulated coke or other sub stance suitable to serve as a regulating medium in a telephone-circuit. The wires or conductors of the circuit are connected with the twometal surfaces 11 0, so that the current has 8 5 to pass through the coke or other regulator, and is therefore subject to vibrations in sympathy with the vibrations caused by the impingement of the sound-waves upon the tube 0.

Upon connecting the posts (1 (l in circuit 0 with a generator of electricity and subjecting the instrument to sound-vibrations, the current is varied in harmony therewith.

In Figs. 8 and4 I have shown another modification of my invention, wherein the vibrating tube or mouth-piece is divided into two parts or halves, c c, placed together with insulating material 0 between them. The action is similar to that of the instruments above described.

What I claim as my invention is 1. In a telephone-transmitter, the combination of a vibratory tube or chamber forming the mouth-piece and a variable resistance in contact therewith, said tube and resistance being included in the circuit, substantially as described.

2. Inatransmitting-telephone,amouth-piece consisting of two concentric cylinders, tubes, or chambers, forming, respectively, the two terminals of an electrical circuit, combined with an interposed variable resistance.

3. In a telephone, a mouth-piece or chamber consisting of a flexible vibratory surface, responsive to sound vibrations, and forming :0 part of the circuit.

4. In a telephone, a vibratory mouth-piece surrounded with a chamber linedwith a con- J OSE DOTTIN HUSBANDS.-

Witnesses:

FRANCIS G. McLELLAN, T. OLIVER \VHEELER. 

